Physics Quiz: Current Electricity Trivia Questions!
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Charge of 60 C passes through an electric lamp in 2 minutes. Then the current in the lamp is
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0.5 A
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30 A
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1 A
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5A
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Dive into the fundamentals of current electricity with this engaging Physics Quiz! Test your understanding of electrical concepts like current, resistance, and power through practical questions. Ideal for students looking to reinforce their knowledge and prepare for advanced studies.
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- 2.
The material through which electric charge can flow easily is
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Copper
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Germanium
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Quartz
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Mica
Correct Answer
A. CopperExplanation
Copper is a good conductor of electricity, meaning it allows electric charge to flow easily through it. This is due to its atomic structure, which allows for the movement of electrons. Copper is commonly used in electrical wiring and circuitry because of its high conductivity. Germanium, quartz, and mica are not as good conductors as copper, so they do not allow electric charge to flow as easily.Rate this question:
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- 3.
The current flowing in a conductor is proportional to
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Drift velocity
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1/ area of cross section
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1/no of electrons
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Square of area of cross section.
Correct Answer
A. Drift velocityExplanation
The current flowing in a conductor is proportional to drift velocity because drift velocity is the average velocity at which free electrons move in a conductor due to an applied electric field. As more electrons move with a higher drift velocity, the overall current in the conductor increases. Therefore, the greater the drift velocity, the greater the current flowing in the conductor.Rate this question:
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- 4.
A toaster operating at 240V has a resistance of 120Ω. The power is
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480 W
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400 W
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2 W
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240 W
Correct Answer
A. 480 WExplanation
The power of an electrical device can be calculated using the formula P = V^2/R, where P is power, V is voltage, and R is resistance. In this case, the voltage is given as 240V and the resistance is given as 120Ω. Plugging these values into the formula, we get P = (240^2) / 120 = 480W. Therefore, the correct answer is 480W.Rate this question:
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- 5.
If the length of a copper wire has a certain resistance R, then on doubling the length its specific resistance
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Will remain the same
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Will be doubled
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Will become 1/4 th
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Will become 4 times
Correct Answer
A. Will remain the sameExplanation
The specific resistance of a material is a constant property that depends on the material itself, not on its length. Therefore, doubling the length of a copper wire will not change its specific resistance.Rate this question:
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- 6.
When two 2Ω resistances are in parallel, the effective resistance is
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1 Ω
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2 Ω
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0.5 Ω
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4 Ω
Correct Answer
A. 1 ΩExplanation
When two resistances are in parallel, the effective resistance is given by the formula 1/Reff = 1/R1 + 1/R2. In this case, both resistances are 2Ω. Plugging in the values, we get 1/Reff = 1/2Ω + 1/2Ω = 2/2Ω = 1Ω. Therefore, the effective resistance when two 2Ω resistances are in parallel is 1Ω.Rate this question:
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- 7.
In the case of insulators, as the temperature decreases, resistivity
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Increases
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Becomes zero
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Decreases
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Remains constant
Correct Answer
A. IncreasesExplanation
As the temperature decreases in the case of insulators, the resistivity increases. This is because insulators have a large energy band gap between their valence band and conduction band. At higher temperatures, more electrons are able to gain enough energy to jump from the valence band to the conduction band, allowing for better conductivity. However, as the temperature decreases, the number of electrons with enough energy decreases, leading to a decrease in conductivity and an increase in resistivity.Rate this question:
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- 8.
If the resistance of a coil is 2 Ω at and α = 0.004 /, then its resistance at is
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2.8 Ω
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0 Ω
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1.4 Ω
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4 Ω
Correct Answer
A. 2.8 ΩExplanation
The resistance of a coil is directly proportional to its temperature coefficient, which is represented by the symbol α. In this case, the temperature coefficient α is given as 0.004 /°C. Since the temperature is not provided in the question, we can assume that it remains constant. Therefore, if the resistance at is 2 Ω, the resistance at will be 2 Ω * (1 + α * ΔT), where ΔT is the change in temperature. Since ΔT is not given, we can assume it to be 0, which means there is no change in temperature. Therefore, the resistance at will be 2 Ω * (1 + 0.004 * 0) = 2 Ω. Thus, the correct answer is 2 Ω.Rate this question:
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- 9.
According to Faraday’s law of electrolysis, when a current is passed, the mass of ions deposited at the cathode is independent of
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Resistance
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Time
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Charge
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Current
Correct Answer
A. ResistanceExplanation
According to Faraday's law of electrolysis, the mass of ions deposited at the cathode is independent of resistance. This means that the amount of substance deposited during electrolysis is determined by the quantity of charge passing through the electrolyte, rather than the resistance of the circuit. In other words, the mass of ions deposited at the cathode is directly proportional to the amount of electric charge passing through the electrolyte, regardless of the resistance in the circuit.Rate this question:
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- 10.
When n resistors of equal resistances (R) are connected in series, the effective resistance is
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NR
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1/nR
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R/n
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N/R
Correct Answer
A. NRExplanation
When n resistors of equal resistances (R) are connected in series, the effective resistance is the sum of the resistances of all the resistors. Since all the resistors have the same resistance (R), the effective resistance would be n times the resistance of each resistor (R). Therefore, the correct answer is nR.Rate this question:
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Current Version
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Mar 20, 2023Quiz Edited by
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Dec 01, 2013Quiz Created by
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